EFFECTS OF SUBSTRATE AND TEMPERATURE ON THE EMERGENCE OF PHACELIA SP. (BORAGINACEAE) SEEDLING
This study aimed to define the best substrate and temperature for the emergence of Phacelia sp. seedling, annual ornamental flower gardens. The experimental design was entirely randomized in a factorial scheme 3×7 (three different types of substrates: vermiculite, sand and sphagnum combined with seven temperature conditions: room temperature, constant at 20, 25, 30 and 35°C, and alternated at 20-30°C and 25-35°C) with 4 replications of 100 seeds each. Emergence (%E) and Emergence Rate (ER) were evaluated. The means of the resulting values were then compared by the Tukey test at 5% confidence level. There was a significant interaction amongst substrates and temperatures for all analyzed variables. For seeds sown in vermiculite and sand, the seedlings had higher %E and emerged fastest at 20°C, room temperature and 20-30°C that did not present statistically significant data. In sphagnum, seedlings showed greater %E in the alternated at 20-30°C, room temperature and 20°C and emerged quickly at room temperature and 20°C that did not present statistically significant data. At room temperature and 20°C, the seedlings had higher %E and emerged faster in vermiculite and sand that did not present statistically significant data. At 25, 30 and 25-35°C, the seedlings showed better %E and emerged fastest in sand. At 35°C, the seedlings showed either in vermiculite and sand were not significantly different in their emergence, but emerged faster in sand. There was not significantly different among substrates in their emergence at 20-30°C, but the seedlings emerged faster in vermiculite and sand. It was concluded that the Phacelia sp. seedlings in all substrates showed greater %E at room temperature, 20°C and 20-30°C. For all temperatures, the seedlings growth parameters were superior when seeds were sown in sand.
Batista, G.S., Romani, G.N., Gimenes, R., Pivetta, K.F.L. and Ferraz, M.V. (2013). EFFECTS OF SUBSTRATE AND TEMPERATURE ON THE EMERGENCE OF PHACELIA SP. (BORAGINACEAE) SEEDLING. Acta Hortic. 999, 235-238
annual ornamental, germination, seedling